Steam-power system



April 19, 1927. ,6 5,336

1 B. SCHROEDER I STEAM rowan SYSTEM Original Filed Jim 18, 1921 /9 Z INVENTOR r W ATTORNEYS Patented Apr. 19, 1927.

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STEAM-POWER $YSTE1VI.

Application filed June 18, 192%, Serial No. 720,728. Renewed. September 22, 192 6.

My present invention relates to steam power systems and particularly to such a system in which the steam generated and condensed and re-supplied to the boiler will opcrate in a closed system, whereby the possibility of introducing air or other gases into the boiler, and particularly a high pressure economizer connected to such a boiler, is minimized.

My invention will be best understood from the annexed drawing and the following description of an illustrative embodiment of my invention, in which 10 is a steam boiler having a high pressure economizer 11 connected by a pipe 12 with the steam and water drum 13 of the boiler. The gases from the boiler, after flowing over the high pressure economizer, pass up through the fine it, through an induced draft fan 15. team from the boiler is supplied through a pipe 16 to a multi-stage steam turbine 17 the exhaust from which is condensed in the condenser 18 and flows through the pipe 19 under pressure of a pump 20 into a feed water heater '21, and from thence through the pipe 22 into a feed water tank 23, the pipe 22 extending preferably to a point adjacent the bottom of the tank 23. The feed water heater 21 may be supplied by steam taken 30 from an i'nterstage point of the steam turbine 17 such steam being led through the pipe 24 to the heater 21, such steam being extracted from the steam flowing from one stage to another of the prime mover 17. I

As is well known, power system-s operating on such a closed cycle must have makeup water supplied from time to time because 01' losses in the cycle, and such make-up water is supplied through a pipe 25 to a make-up water heater 26-, such supply being controlled by a valve 27 controlled, in turn, by a float 28 in the feed water tank 23. From the make-up Water heater 26, water flows through the pipe 29 into the feed water tank 23, the pipe 29 preferably being provided with a deep water seal, as shown, with the end of the pipe terminating near the bottom of the tank 23.

The water in the make-up water heater 26 is heated, in the form illustrated, by steam entering through the pipe 30 which passes through loops 31 within the heater 26, the uncondensed steam and the condensate passing out through the pipe 32 to the feed water heater 21. The pipe 32 is provided with a balanced back pressure valve 33. The steam supplied through the pipe may be the eX- haust from the boiler room auxiliaries or may be live steam, if desired. Preferably a suflicient amount of steam will be supplied through the pipe 30 to boil the water in the tank 26 to more thoroughly drive ofi? the air and gases in the make-up water.

The condensate from the steam supplied to the heater 21 passes down through the pipe 3 1 and is forced by the pump through the pipe 36 into the pipe 22, and from thence into the tank 23.

In order to vent the make-up water heater 26, I provide a pipe 37 connected to the steam space thereof, the other end of the pipe 37 being connected to the inlet side of the induced draft fan 15. In the form illustrated,-the feed water tank 23 is similarly vented through the pipe'38 to the inlet side of the induced draft fan. By means oi": the pipes 37 and 38, any steam, together with the air or gases driven from the water by the heating thereof, will be removed from the heater 26 and the tank 23 by the suction provided by the fan 15, this suction producing a sub-atmospheric pressure in the tanks 26 and 23, so that the air and gases will be removed more readily from the water contained in such heater and tank.

It will be seen that the arrangement which I have illustrated is particularly adapted to prevent the entrance of air and gases into the system. The condensate from the prime mover is returned to the closed tank 23 with out contact with the air and is heated in the heater 21 so that any air or gases which may have been picked up through leakage or the like will be driven 01? from the water inthe tank 23 and will be removed through the vent pipe 38. Similarly, the make-up water entering through the pipe 25 will have its air and gases driven off by the boiling in the heater 26, the gases being removed through the vent 3'7 and this deaerated water will then pass into the tank 23 through the deepwater seal provided. By reason of the presence of this water seal, even it the tank 26 should become empty, no air can enter through the pipe 29 into the tank The deaerated Water is forced through the pipe 39 by means of the pump 40 into the economizer 11,, from whence it passes into the drum 13 of the boiler through the pipe 12.

Itwill also be seen that any excess steam,

together with the hot condensate from the heating coils 31, will be used to heat the feed water in the heater 21 to thus complete the condensation of the steam, and this condensate will also be returned to the feed tank 23. The interstage exhaust steam to the pipe 241: may be used in suilicient quantity to raise the feed water to the desired temperature.

3y utilizing the induced draft fan 15 as a means for providing suction to remove the gases from either the make-up water heater 26 or the feed tank 23, or both, I have provided a simple system which does not require any additional mechanism and, at the same time, one which will be operating at all times when the system is in ope -ation.

It will be understood that the embodiment of my invention may be widely varied and that certain features of my invention may be used independently of other features.

I claim:

1. In a steam power system, a steam boiler having an induced draft fan, a multistage steanrdriven prime mover connected to said boiler, a feed water tank, a makeup water heater, :1 feed water heater, means to supply to said feed water heater steam er;- hausted from an interstage point in said prime mover, means to pass condensate from said prime mover through said feed water heater and into said feed water tank, means to pass heated make-up water from said make-up water heater to said feed water tank, a connection from said feed water tank to the boiler, and pipes connecting the steam spaces of said make-up water heater and said feed water tank with the inlet side of said induced draft fan 2. In a steam power system, a steam boiler having an induced draft fan, a steamdriven prime mover connected to said boiler, a feed water tank, a make-up water heater, a feed water heater, means to pass condensate from said prime mover through said feed water heater and into said feed water tank, means to pass heated make-up water from the make-up water heater to said feed water tank, a connection from said feed water tank to the boiler, and pipes connecting the steam spaces of said makeup water heater and said feed water tank with the inlet side of said induced draft fan.

3. In a steam power system, a steam boiler having an induced draft fan, a steam-driven prime mover connected to said boiler, a feed water tank, a make-up water heater, a feed water heater, means to pass condensate from said prime mover through said feed water heater and into said feed water tank, means to pass heated make-up water from the make-up water heater to said feed water tank, a connection from said feed water tank to the boiler, and a pipe connecting the steam space of said make-up water heater with the inletside of said induced draft fan.

l. In a steam power system,asteam boiler, a steanrdriven prime mover connected to said boiler, a feed water tank, a make-up water heater, a feed water heater, means to pass condensate from said prime mover through said feed water heater and into said feed water tank, means to pass heated make-up water from the make-up Water heater to said feed water tank, a connection from said feed water tank to the boiler, a steam supply pipe to supply steam to said make-up water heater, and a pipe to lead the uncondensed steam and the condensate from said steam supply pipe through said feed water heater and into said feed water tank.

:5. In a steam power system, a steam boiler having an induced draft fan, a steam-driven prime mover connected to said boiler, a feed water tank, pipes to lead the condcnsate from said prime mover to said feed water tank, a make-up water heater, a pipe connecting said make-up water heater with said feed water tank and having a water seal to prevent entrance of air into said feed water tank when said make-up water heater is empty, and a pipe connecting the steam space of said make-up water heater with the inlet side of said induced draft fan.

6. In a boiler system, a steam boiler having; an induced draft fan, a makeup water heater and a pipe connecting the steam space of said heater with the inlet side of said induced draft fan.

7. In a boiler system, a steam boiler having an induced draft fan, a makeup water heater, :1 feed water tank, connections between said tank and said heater, and pipes connecting the steam spaces of said heater and said tank with the inlet side of said induced draft fan.

8.111 a steam power system, a steam boiler, a steamdriven prime mover connected to said boiler and having'a condenser for the exhaust steam from said prime mover, a feed water tank, piping closed to atmosphere to lead the condensate from said condenser to said feed water tank and beneath the lowest water level therein, a make-up water heater, and a pipe connecting said heater with said tank and provided with a water seal to prevent the entrance of air into said tank when said heater is empty.

BERNHARD SCI-IROEDER. 

